Someone alluded to it in the following post:
http://community.wd.com/t/hardware-hacking/92736/5
There is some talk about setting up a server for PXE network booting on Debian using TFTP and DHCP. However the Debain version the v4.x firmware version My Cloud’s use is a non standard version using 64K page file. Doing an apt-get on a v4.x firmware My Clouds tends to cause all sorts of problems up to and including bricking the My Cloud.
https://debian-administration.org/article/478/Setting_up_a_server_for_PXE_network_booting
If one dumps the Debain OS and uses something else like DSM they might be able to run a PXE server to allow for network booting.
http://community.wd.com/t/synology-os-on-wd-my-cloud-new-hope/95650
http://community.wd.com/t/clean-os-debian-openmediavault-and-other-firmwares/93714
